ok this is the most annaoying problem on the planet. often when i go afk, ill come bak to my comp being frozen, no apps running, mouse cant move, the only way i can close is turn it of manully. some times aven i will log in and it will freeze right there. what do i do? i need help

My first guess would be that your computer doesn't like your screensaver if you have one enabled that is. I would change your screensaver to none if it's an LCD, and if it's a CRT I would set the power option to turn it off instead of using a screensaver.